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Varargs Value Collection

Varargs Value Collection — Converting varargs to generic values

Synopsis


#include <glib-object.h>
#include <gobject/gvaluecollector.h>


union       GTypeCValue;
#define     G_VALUE_COLLECT                 (value, var_args, flags, __error)
#define     G_VALUE_LCOPY                   (value, var_args, flags, __error)
#define     G_VALUE_COLLECT_FORMAT_MAX_LENGTH

Description

Details

union GTypeCValue

union GTypeCValue
{
  gint     v_int;
  glong    v_long;
  gint64   v_int64;
  gdouble  v_double;
  gpointer v_pointer;
};

A union holding one collected value.

G_VALUE_COLLECT()

#define     G_VALUE_COLLECT(value, var_args, flags, __error)

Collects a variable argument value from a va_list. We have to implement the varargs collection as a macro, because on some systems va_list variables cannot be passed by reference.

`value` :	a GValue return location. `value` is supposed to be initialized according to the value type to be collected
`var_args` :	the va_list variable; it may be evaluated multiple times
`flags` :	flags which are passed on to the `collect_value()` function of the GTypeValueTable of `value`.
`__error` :	a gchar** variable that will be modified to hold a `g_new()` allocated error messages if something fails

G_VALUE_LCOPY()

#define     G_VALUE_LCOPY(value, var_args, flags, __error)

Collects a value's variable argument locations from a va_list.

`value` :	a GValue return location. `value` is supposed to be initialized according to the value type to be collected
`var_args` :	the va_list variable; it may be evaluated multiple times
`flags` :	flags which are passed on to the `lcopy_value()` function of the GTypeValueTable of `value`.
`__error` :	a gchar** variable that will be modified to hold a `g_new()` allocated error messages if something fails

G_VALUE_COLLECT_FORMAT_MAX_LENGTH

#define	G_VALUE_COLLECT_FORMAT_MAX_LENGTH	(8)

The maximal number of GTypeCValues which can be collected for a single GValue.

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